Biomagnification of POPs is most prominent in which trophic level?

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Biomagnification happens because persistent organic pollutants are stored in fatty tissues and aren’t easily eliminated. As the food chain progresses, predators eat many contaminated prey, so each step up the chain adds more of the pollutant to the predator’s body. This accumulation compounds with every trophic transfer, so concentrations are highest in the top predators. That’s why tertiary consumers show the strongest biomagnification of POPs. Primary producers and primary consumers have lower levels because they’re further down the chain and have fewer trophic transfers, while secondary consumers are intermediate. In real ecosystems, apex predators like certain birds of prey or large marine mammals can end up with the most contaminated tissues.